题目内容
Daniel is busy these days. I doubt he will come to my birthday party or not this Sunday.
| A．that | B．when |
| C．how | D．whether |
D
解析试题分析：句意：丹尼尔这些天忙，我怀疑他是否这周日能来参加我的生日聚会。that无意义，when当，how如何， whether是否；that用于doubt的否定句，whether用于doubt的肯定句， 故选D .
考点：考查连词
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